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Old 08-19-2014, 02:25 PM   #43
76C10Stepside
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Join Date: Feb 2012
Location: Olympia, WA
Posts: 300
Re: 89 S10 4.3 Need help troubleshooting TBI/IAC Idle issue

Quote:
Originally Posted by ChevyTech View Post
If it has a bad injector you only have to take out the bad one, but you need to look at the aluminum casting very closely.

When you install injectors without lube on the o-rings it can crack the TBI housing.

Injectors are $4 each at the local U=Pull-It where I live.

If the problem comes and goes it is more likely an injector, then a crack, but look to see if you can see a crack before spending money on an injector.
Thanks for both tips, could save me a good chunk of change! I will check the housing first and go from there. The first time you explained why the o-rings need to be lubricated, I had already rebuilt the TBI (before I started this thread). That won't happen again! :-(

Will report back when I identify what broke...
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